MP3 Database uses Apache/PHP/MySQL to work as an MP3/OGG Jukebox. Users select songs from a client machine; the program will pull from a CD on the server and play (using mpg123/ogg123). Users can also alter the volume with a Web interface to aumix.

burnCDDA is a console frontend to cdrdao,
cdrecord, MPlayer, mpg321, oggdec, mppdec, flac, normalize, and mp3_check. It can be used to create audio CDs from an M3U playlist (the playlist format of XMMS
and amaroK) or from files inside a directory. It supports MP3, OGG Vorbis, Musepack, FLAC, WMA, M4A, and WAV files, and it might be the easiest way to copy an audio CD.

Ampache is a Web-based audio file manager. It allows you to view, edit, and play your audio files via the Web. It has support for playlists, artist and album views, album art, random play, playback via HTTP with on-the-fly transcoding and downsampling, vote based playback, playback via MPD and Icecast, an integrated Flash player, and per-user themes and song play tracking. You can also link multiple Ampache servers together using XML-RPC. Ampache supports gettext translations and has full translations into many languages.

PaulStretch is a program for stretching audio
data. It is suitable only for extreme sound
stretching (like 50 times) and for applying
special effects by "spectral smoothing" the
sounds. It can transform any sound or music to a
texture. It features real-time playback
capabilities.

mplayer-tools is a CLI tool collection for MPlayer with a GUI frontend.You can record and timeshift from your TV tuner. It also remembers movies and positions to resume a movie easily. It has support for movie series, play history, playlist in the GUI, and many useful options.

Play it slowly is a program to play back audio
files at a different speed or pitch. It allows you
to loop over a certain part of a file. It's
intended to help you learn or transcribe songs. It
can also play videos thanks to gstreamer.

MythTV is a project aiming to create a homebrew set-top box. The end goal is to have a nice interface for watching TV, recording shows, listening to music, etc., all displayed on a TV and controlled by a remote.